Connecting Rod Type Two-Level Locking Device, Hopper Car Bottom Door and Hopper Car

ABSTRACT

The present invention discloses a connecting rod type two-level locking device, a hopper car bottom door and a hopper car, and belongs to the technical field of rail wagons. The connecting rod type two-level locking device includes a transmission shaft, a door opening arm, a first roller, a second roller, a first locating pin, a standstill locking disk and a linkage mechanism. The hopper car bottom door includes the connecting rod type two-level locking device. The hopper car includes the bottom door. Even if the connecting rod type two-level locking device is accidentally stressed, the linkage mechanism cannot rotate, and at this time, the slave arm cannot rotate neither. The accidental opening of the hopper car bottom door can be avoided. The hopper car is more reliable to use.

FIELD OF THE INVENTION

The present invention relates to the technical field of rail wagons, and particularly relates to a connecting rod type two-level locking device, a hopper car bottom door and a hopper car.

BACKGROUND OF THE INVENTION

Most existing railroad hopper cars adopt box type bottom door structures, and bottom doors are controlled by bottom door opening and closing mechanisms to open and close to achieve an automatic unloading function. Under this structure, the opening, closing and locking of the bottom doors completely depend on the control of the bottom door opening and closing mechanisms. In the case of failure of the bottom door opening and closing mechanisms, the bottom doors are out of effective control and are completely at a free rotation state, and the bottom doors are liable to automatically open due to vibration in a vehicle operation process, resulting in commodity leakage or automatic unloading to affect the traffic safety.

The bottom door opening and closing mechanisms are key components for ensuring the normal unloading of the railroad hopper cars and require convenient opening and closing operations and stable performance, and the existing mechanical impact self-unloading type bottom door opening and closing mechanisms have the above characteristics, thus being widely used on the railroad hopper cars at home and abroad at present. Moreover, corresponding self-locking devices are provided to prevent automatic opening of the bottom doors due to such reasons as vibration and the like or abnormal opening of the bottom doors caused by other factors in a transportation process.

However, the current two-level locking solutions of the hopper cars adopting the mechanical impact self-unloading type bottom door opening and closing mechanisms are based on the locking operation handle principle, which has relatively limited adaptability and cannot meet the requirements of bilaterally opening and closing the bottom doors.

SUMMARY OF THE INVENTION

To solve the above problems, the present invention provides a connecting rod type two-level locking device arranged on a hopper car bottom door, which is opened and closed by a planar four-bar linkage passing a dead point, a hopper car bottom door including the connecting rod type two-level locking device and a hopper car including the bottom door.

The connecting rod type two-level locking device provided by the present invention includes a transmission shaft, a door opening arm, a first roller, a second roller, a first locating pin, a standstill locking disk and a linkage mechanism, wherein the door opening arm includes a master arm and a slave arm, a slotted hole is formed on one end of the master arm, the other end of the master arm is fixedly connected to the transmission shaft, the first locating pin is fixedly connected to the first roller, the first roller forms a sliding pair with the slotted hole through the first locating pin, the second roller is hinged with one end of the slave arm, and the other end of the slave arm is fixedly connected to the transmission shaft;

the standstill locking disk is fixedly connected to the transmission shaft, and convex teeth are arranged at the bottom end of the standstill locking disk; the linkage mechanism includes an unlocking lever, an unlocking connecting rod and a linkage locking pawl, the unlocking lever is provided with an end a and an end b, the unlocking connecting rod is provided with an end c and an end d, the linkage locking pawl is provided with an end m and an end n, the end b of the unlocking lever is hinged with the end c of the unlocking connecting rod, and the end d of the unlocking connecting rod is hinged with the end m of the linkage locking pawl; the middle position of the unlocking lever is hinged with the master arm, the end a of the unlocking lever is lapped on the first roller, and the end n of the linkage locking pawl is hinged with the slave arm; in general, the first locating pin is located at the lower semicircle of the slotted hole, at this time, the end m of the linkage locking pawl abuts against the convex teeth, and the connecting rod type two-level locking device is a truss; when the first roller is applied with an upward acting force, the first roller is driven by the first locating pin to slide upwards in the slotted hole, when the first locating pin is located at the upper semicircle of the slotted hole, the end m of the linkage locking pawl deviates from the convex teeth, at this time, a force is continuously applied to the first roller, and the slave arm moves together with the master arm and the linkage mechanism.

Preferably, the connecting rod type two-level locking device further includes a torsion spring, wherein the torsion spring is sleeved on the hinge point of the end n of the linkage locking pawl and the slave arm in an intercrossing manner, one end of the torsion spring is fixedly connected to the slave arm, the other end of the torsion spring is fixedly connected to the linkage locking pawl, and the torsion spring can provide a standstill locking force to the linkage mechanism.

Preferably, a reserved amount is arranged between the end m of the linkage locking pawl and the convex teeth, and the range of the reserved amount is the maximum dead point passing position to the maximum dead point departing position of the door opening arm.

Preferably, the range of the reserved amount is the maximum dead point passing position to the minimum dead point passing position of the door opening arm.

The present invention further provides a hopper car bottom door, including the connecting rod type two-level locking device provided by the present invention.

The present invention further provides a hopper car, including the hopper car bottom door provided by the present invention.

According to the connecting rod type two-level locking device provided by the present invention, the standstill locking disk and the linkage mechanism are additionally arranged on the basis of the hopper car bottom door, which is opened and closed by the planar four-bar linkage passing the dead point, in general, since the end m of the linkage locking pawl abuts against the convex teeth of the standstill locking disk due to the self-gravity of the first roller and the unlocking lever, the connecting rod type two-level locking device is the truss, even if the first roller is accidently applied with an upward acting force, as long as the first locating pin does not arrive at the upper semicircle of the slotted hole formed on the mater arm and is continuously stressed, the linkage mechanism cannot rotate, and at this time, the slave arm cannot rotate neither.

The hopper car bottom door provided by the present invention includes the connecting rod type two-level locking device provided by the present invention, even if the first roller is accidently applied with an upward acting force, as long as the first locating pin does not arrive at the upper semicircle of the slotted hole formed on the mater arm, the linkage mechanism cannot rotate, at this time, the slave arm cannot rotate neither, so that the accidental opening of the hopper car bottom door is avoided.

The hopper car provided by the present invention has the hopper car bottom door provided by the present invention, and the accidental opening of the hopper car bottom door can be avoided, so that the application is more reliable.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a structure of a connecting rod type two-level locking device (with linkage mechanism removed) provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a structure of a connecting rod type two-level locking device provided by an embodiment of the present invention, when the end m of a linkage locking pawl abuts against the convex teeth of a standstill locking disk;

FIG. 3 is a schematic diagram of a structure of a connecting rod type two-level locking device provided by an embodiment of the present invention, when the end m of a linkage locking pawl just deviates from the convex teeth of a standstill locking disk;

FIG. 4 is a schematic diagram of a structure of a connecting rod type two-level locking device provided by an embodiment of the present invention, when a slave arm moves to the limit;

FIG. 5 is a schematic diagram of a structure of a reserved amount between the end m of a linkage locking pawl and convex teeth of a connecting rod type two-level locking device provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a structure of a torsion spring and a connection of the torsion spring with a slave arm and a linkage locking pawl of a connecting rod type two-level locking device provided by an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To better understand the present invention, a detailed illustration of the present invention will be given below in combination with accompanying drawings and specific embodiments.

See FIG. 1 to FIG. 4, a connecting rod type two-level locking device provided by the present invention includes a transmission shaft 1, a door opening arm, a first roller 8, a second roller 10, a first locating pin 7, a standstill locking disk 24 and a linkage mechanism, wherein the door opening arm includes a master arm 2 and a slave arm 3, a slotted hole 6 is formed on one end 4 of the master arm 2, the other end of the master arm is fixedly connected to the transmission shaft 1, the first locating pin 7 is fixedly connected to the first roller 8, the first roller 8 forms a sliding pair with the slotted hole 6 through the first locating pin 7, the second roller 10 is hinged with one end 5 of the slave arm 3, the reference number of the hinge point is 9, and the other end of the slave arm is fixedly connected to the transmission shaft 1.

The standstill locking disk 24 is fixedly connected to the transmission shaft 1, and convex teeth 25 are arranged at the bottom end of the standstill locking disk 24.

The linkage mechanism includes an unlocking lever 11, an unlocking connecting rod 15 and a linkage locking pawl 20, the unlocking lever 11 is provided with an end a 12 and an end b 13, the unlocking connecting rod 15 is provided with an end c 16 and an end d 17, the linkage locking pawl 20 is provided with an end m 21 and an end n 22, the end b 13 of the unlocking lever 11 is hinged with the end c 16 of the unlocking connecting rod 15, the reference number of the hinge point is 18, the end d 17 of the unlocking connecting rod 15 is hinged with the end m 21 of the linkage locking pawl 20, and the reference number of the hinge point is 19.

The middle position of the unlocking lever 11 is hinged with the master arm 2, the reference number of the hinge point is 14, the end a 12 of the unlocking lever 11 is lapped on the first roller 8, and the end n of the linkage locking pawl 20 is hinged with the slave arm 3.

See FIG. 2, in general, the first locating pin 7 is located at the lower semicircle of the slotted hole 6, at this time, the end m 21 of the linkage locking pawl 20 abuts against the convex teeth 25, and the connecting rod type two-level locking device is a truss.

See FIG. 3, when the first roller 8 is applied with an upward acting force, the first roller 8 is driven by the first locating pin 7 to slide upwards in the slotted hole 6, when the first locating pin 7 is located at the upper semicircle of the slotted hole 6, the end m 21 of the linkage locking pawl 20 deviates from the convex teeth 25, at this time, a force is continuously applied to the first roller 8, and the slave arm 3 moves together with the master arm 2 and the linkage mechanism, until moving to the position as shown in FIG. 4.

According to the connecting rod type two-level locking device provided by the present invention, the standstill locking disk 24 and the linkage mechanism are additionally arranged on the basis of the hopper car bottom door, which is opened and closed by the planar four-bar linkage passing the dead point, in general, since the end m 21 of the linkage locking pawl 20 abuts against the convex teeth 25 of the standstill locking disk 24 due to the self-gravity of the first roller 8 and the unlocking lever 11, the connecting rod type two-level locking device is the truss, even if the first roller 8 is accidently applied with an upward acting force, as long as the first locating pin 7 does not arrive at the upper semicircle of the slotted hole 6 formed on the mater arm 2 and is continuously stressed, the linkage mechanism cannot rotate, and at this time, the slave arm 3 cannot rotate neither.

Wherein, the transmission shaft 1 is provided with an eccentricity passing distance, the larger the eccentricity passing distance is, the larger the pressing force of the end m of the linkage locking pawl 20 and the convex teeth 25 of the standstill locking disk 24 is, the larger the acting force needing to be applied to the first roller 1 is, and the better the reliability of the connecting rod type two-level locking device provided by the present invention can be guaranteed.

Wherein, see FIG. 6, the connecting rod type two-level locking device can further include a torsion spring 29, the torsion spring 29 is sleeved on the hinge point 23 of the end n 22 of the linkage locking pawl 20 and the slave arm 3 in an intercrossing manner, one end 30 of the torsion spring 29 is fixedly connected to the slave arm 3, the other end 31 of the torsion spring is fixedly connected to the linkage locking pawl 20, the torsion spring 29 can provide a standstill locking force to the linkage mechanism, and the standstill locking force is used for preventing the linkage mechanism from rotating together with the self-gravity of the first roller 8 and the unlocking lever 11, so that the connecting rod type two-level locking device provided by the present invention is more reliable.

Wherein, see FIG. 5, a reserved amount is arranged between the end m of the linkage locking pawl 20 and the convex teeth 25, the range of the reserved amount is the maximum dead point passing position 26 to the maximum dead point departing position 28 of the door opening arm, at this time, the connecting rod type two-level locking device can not only be locked in two levels, but also can be applied to new manufacture and overhaul, the reliability and adaptability of the connecting rod type two-level locking device are improved, and the connecting rod type two-level locking device is convenient to overhaul and maintain.

Wherein, considering that the position passing the dead point of the used transmission shaft 1 in an opening and closing process is decreased as compared with that in new manufacture, a reserved amount away from the dead point of the transmission shaft is considered in the locking position of the linkage locking pawl 20, and the range of the reserved amount is the maximum dead point passing position 26 to the minimum dead point passing position 27 of the door opening arm.

The present invention further provides a hopper car bottom door, including the connecting rod type two-level locking device provided by the present invention.

The present invention further provides a hopper car, including the hopper car bottom door provided by the present invention.

The hopper car bottom door provided by the present invention includes the connecting rod type two-level locking device provided by the present invention, even if the first roller is accidently applied with an upward acting force, as long as the first locating pin does not arrive at the upper semicircle of the slotted hole formed on the mater arm, the linkage mechanism cannot rotate, at this time, the slave arm cannot rotate neither, so that the accidental opening of the hopper car bottom door is avoided.

The hopper car provided by the present invention has the hopper car bottom door provided by the present invention, and the accidental opening of the hopper car bottom door can be avoided, so that the application is more reliable.

The foregoing specific implementations are further detailed descriptions of the purposes, technical solutions and beneficial effects of the present invention, and it should be understood that, the foregoing descriptions are merely specific implementations of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions and improvements or the like made within the spirit and principle of the present invention shall fall within the protection scope of the present invention. 

1. A two-level locking device, comprising; a first transmission shaft; a second transmission shaft; a clutch; a pressure mechanism; and a reset mechanism; wherein under the pressure action of the pressure mechanism, the clutch separates the first transmission shaft from the second transmission shaft, and under the action of the reset mechanism, the clutch joints the first transmission shaft with the second transmission shaft.
 2. The device of claim 1, wherein the clutch comprises a locking key limiting seat and a locking key, wherein the locking key limiting seat is fixedly connected to the first transmission shaft, the locking key is fixedly connected to the second transmission shaft, and the pressure mechanism can apply a pressure to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft; the reset mechanism can apply a force to the locking key to insert the locking key into the locking key limiting seat again, so that the first transmission shaft and the second transmission shaft are re jointed to reset.
 3. The device of claim 1, wherein the pressure mechanism comprises a pressure lever, a first bent lever, a first rotating shaft, a force application arm and a force application unit, wherein the pressure lever comprises an end M and an end N, the first bent lever comprises an end A and an end B, the end M of the pressure lever is hinged with the locking key, the end A of the first bent lever is connected to the end N of the pressure lever, the first bent lever is connected to the force application arm through the first rotating shaft, the force application unit can apply an upward acting force to the end B of the first bent lever, such that the first bent lever rotates clockwise with the first rotating shaft as the shaft to propel the pressure lever to move rightwards, and the pressure lever applies a rightward acting force to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft.
 4. The device of claim 3, wherein the force application unit comprises a first roller, a first locating pin and a first connecting piece, wherein a first through hole and a first slotted hole are formed on the force application arm, a second through hole and a third through hole are formed on the first connecting piece, a fourth through hole is formed on the first roller, the end B of the first bent lever sequentially penetrates through the first through hole and the second through hole, the first locating pin is inserted in the second through hole, the fourth through hole and the first slotted hole, when the first locating pin is located at a lower semicircle of the first slotted hole, a lower edge of the first roller protrudes from the force application arm to apply an upward acting force to the first roller, the first roller drives the first locating pin to move upwards, the first locating pin drives the first connecting piece to move upwards, and the first connecting piece applies an upward acting force to the end B of the first bent lever, until the first locating pin arrives at the upper semicircle of the first slotted hole.
 5. The device of claim 1, wherein the reset mechanism comprises a pull rod, a stop dog, an elastic component, a second bent lever, a second rotating shaft, a third rotating shaft, a plug, a reset arm and a limiting unit, wherein the pull rod comprises an end P and an end Q, the second bent lever comprises an end C and an end D, the end P of the pull rod is hinged with the locking key, the end Q of the pull rod is connected to the end C of the second bent lever through the third rotating shaft, the second bent lever is connected to the reset arm through the second rotating shaft, a holding space for the movement of the end Q of the pull rod, the third rotating shaft and the end C of the second bent lever is arranged in the plug, the stop dog is fixedly connected to the pull rod, one end of the elastic component is fixedly connected to the stop dog, the other end of the elastic component is fixedly connected to the plug, when the locking key is jointed with the locking key limiting seat, the reset arm can prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft, and at this time, the elastic component is at a tensile state.
 6. The device of claim 5, wherein the limiting unit comprises a second roller, a second locating pin and a second connecting piece, wherein a fifth through hole and a second slotted hole are formed on the reset arm, a sixth through hole and a seventh through hole are formed on the second connecting piece, an eighth through hole is formed on the second roller, the end D of the second bent lever sequentially penetrates through the fifth through hole and the sixth through hole, the second locating pin is inserted in the sixth through hole, the eighth through hole and the second slotted hole, when the locking key is jointed with the locking key limiting seat, the second locating pin is located at the upper semicircle of the second slotted hole, and the upper semicircle of the second slotted hole prevents the second locating pin from moving upwards to prevent the second connecting piece from moving upwards, so as to prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft.
 7. A hopper car bottom door, comprising: a two-level locking device comprising a first transmission shaft, a second transmission shaft, a clutch, a pressure mechanism comprising at least a force application arm, and a reset mechanism comprising at least a reset arm, wherein under the pressure action of the pressure mechanism, the clutch separates the first transmission shaft from the second transmission shaft, and under the action of the reset mechanism, the clutch joints the first transmission shaft with the second transmission shaft; and wherein the force application arm is a first door opening and closing arm of the hopper car bottom door, and the reset arm is a second door opening and closing arm of the hopper car bottom door.
 8. The hopper car bottom door of claim 7, wherein the clutch comprises a locking key limiting seat and a locking key, wherein the locking key limiting seat is fixedly connected to the first transmission shaft, the locking key is fixedly connected to the second transmission shaft, and the pressure mechanism can apply a pressure to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft; the reset mechanism can apply a force to the locking key to insert the locking key into the locking key limiting seat again, so that the first transmission shaft and the second transmission shaft are re-jointed to reset.
 9. The hopper car bottom door of claim 7, wherein the pressure mechanism further comprises a pressure lever, a first bent lever, a first rotating shaft, and a force application unit, wherein the pressure lever comprises an end M and an end N, the first bent lever comprises an end A and an end B, the end M of the pressure lever is hinged with the locking key, the end A of the first bent lever is connected to the end N of the pressure lever, the first bent lever is connected to the force application arm through the first rotating shaft, the force application unit can apply an upward acting force to the end B of the first bent lever, such that the first bent lever rotates clockwise with the first rotating shaft as the shaft to propel the pressure lever to move rightwards, and the pressure lever applies a rightward acting force to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft.
 10. The hopper car bottom door of claim 9, wherein the force application unit comprises a first roller, a first locating pin and a first connecting piece, wherein a first through hole and a first slotted hole are formed on the force application arm, a second through hole and a third through hole are formed on the first connecting piece, a fourth through hole is formed on the first roller, the end B of the first bent lever sequentially penetrates through the first through hole and the second through hole, the first locating pin is inserted in the second through hole, the fourth through hole and the first slotted hole, when the first locating pin is located at a lower semicircle of the first slotted hole, a lower edge of the first roller protrudes from the force application arm to apply an upward acting force to the first roller, the first roller drives the first locating pin to move upwards, the first locating pin drives the first connecting piece to move upwards, and the first connecting piece applies an upward acting force to the end B of the first bent lever, until the first locating pin arrives at the upper semicircle of the first slotted hole.
 11. The hopper car bottom door of claim 7, wherein the reset mechanism further comprises a pull rod, a stop dog, an elastic component, a second bent lever, a second rotating shaft, a third rotating shaft, a plug, and a limiting unit, wherein the pull rod comprises an end P and an end Q, the second bent lever comprises an end C and an end D, the end P of the pull rod is hinged with the locking key, the end Q of the pull rod is connected to the end C of the second bent lever through the third rotating shaft, the second bent lever is connected to the reset arm through the second rotating shaft, a holding space for the movement of the end Q of the pull rod, the third rotating shaft and the end C of the second bent lever is arranged in the plug, the stop dog is fixedly connected to the pull rod, one end of the elastic component is fixedly connected to the stop dog, the other end of the elastic component is fixedly connected to the plug, when the locking key is jointed with the locking key limiting seat, the reset arm can prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft, and at this time, the elastic component is at a tensile state.
 12. The hopper car bottom door of claim 11, wherein the limiting unit comprises a second roller, a second locating pin and a second connecting piece, wherein a fifth through hole and a second slotted hole are formed on the reset arm, a sixth through hole and a seventh through hole are formed on the second connecting piece, an eighth through hole is formed on the second roller, the end D of the second bent lever sequentially penetrates through the fifth through hole and the sixth through hole, the second locating pin is inserted in the sixth through hole, the eighth through hole and the second slotted hole, when the locking key is jointed with the locking key limiting seat, the second locating pin is located at the upper semicircle of the second slotted hole, and the upper semicircle of the second slotted hole prevents the second locating pin from moving upwards to prevent the second connecting piece from moving upwards, so as to prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft.
 13. A hopper car, comprising: a hopper car bottom door including a two-level locking device a first transmission shaft, a second transmission shaft, a clutch, a pressure mechanism comprising at least a force application arm, and a reset mechanism comprising at least a reset arm, wherein under the pressure action of the pressure mechanism, the clutch separates the first transmission shaft from the second transmission shaft, and under the action of the reset mechanism, the clutch joints the first transmission shaft with the second transmission shaft; and wherein the force application arm is a first door opening and closing arm of the hopper car bottom door, and the reset arm is a second door opening and closing arm of the hopper car bottom door.
 14. The hopper car of claim 13, wherein the clutch comprises a locking key limiting seat and a locking key, wherein the locking key limiting seat is fixedly connected to the first transmission shaft, the locking key is fixedly connected to the second transmission shaft, and the pressure mechanism can apply a pressure to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft; the reset mechanism can apply a force to the locking key to insert the locking key into the locking key limiting seat again, so that the first transmission shaft and the second transmission shaft are re jointed to reset.
 15. The hopper car of claim 13, wherein the pressure mechanism further comprises a pressure lever, a first bent lever, a first rotating shaft, and a force application unit, wherein the pressure lever comprises an end M and an end N, the first bent lever comprises an end A and an end B, the end M of the pressure lever is hinged with the locking key, the end A of the first bent lever is connected to the end N of the pressure lever, the first bent lever is connected to the force application arm through the first rotating shaft, the force application unit can apply an upward acting force to the end B of the first bent lever, such that the first bent lever rotates clockwise with the first rotating shaft as the shaft to propel the pressure lever to move rightwards, and the pressure lever applies a rightward acting force to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft.
 16. The hopper car of claim 15, wherein the force application unit comprises a first roller, a first locating pin and a first connecting piece, wherein a first through hole and a first slotted hole are formed on the force application arm, a second through hole and a third through hole are formed on the first connecting piece, a fourth through hole is formed on the first roller, the end B of the first bent lever sequentially penetrates through the first through hole and the second through hole, the first locating pin is inserted in the second through hole, the fourth through hole and the first slotted hole, when the first locating pin is located at a lower semicircle of the first slotted hole, a lower edge of the first roller protrudes from the force application arm to apply an upward acting force to the first roller, the first roller drives the first locating pin to move upwards, the first locating pin drives the first connecting piece to move upwards, and the first connecting piece applies an upward acting force to the end B of the first bent lever, until the first locating pin arrives at the upper semicircle of the first slotted hole.
 17. The hopper car of claim 13, wherein the reset mechanism further comprises a pull rod, a stop dog, an elastic component, a second bent lever, a second rotating shaft, a third rotating shaft, a plug, and a limiting unit, wherein the pull rod comprises an end P and an end Q, the second bent lever comprises an end C and an end D, the end P of the pull rod is hinged with the locking key, the end Q of the pull rod is connected to the end C of the second bent lever through the third rotating shaft, the second bent lever is connected to the reset arm through the second rotating shaft, a holding space for the movement of the end Q of the pull rod, the third rotating shaft and the end C of the second bent lever is arranged in the plug, the stop dog is fixedly connected to the pull rod, one end of the elastic component is fixedly connected to the stop dog, the other end of the elastic component is fixedly connected to the plug, when the locking key is jointed with the locking key limiting seat, the reset arm can prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft, and at this time, the elastic component is at a tensile state.
 18. The hopper car of claim 17, wherein the limiting unit comprises a second roller, a second locating pin and a second connecting piece, wherein a fifth through hole and a second slotted hole are formed on the reset arm, a sixth through hole and a seventh through hole are formed on the second connecting piece, an eighth through hole is formed on the second roller, the end D of the second bent lever sequentially penetrates through the fifth through hole and the sixth through hole, the second locating pin is inserted in the sixth through hole, the eighth through hole and the second slotted hole, when the locking key is jointed with the locking key limiting seat, the second locating pin is located at the upper semicircle of the second slotted hole, and the upper semicircle of the second slotted hole prevents the second locating pin from moving upwards to prevent the second connecting piece from moving upwards, so as to prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft. 